code: def pytest_configure(config):
      config.addinivalue_line(
          "markers",
          "slow: mark tests as slow (include in run with --test-slow)",
      )
  
file_path: prophet/python/prophet/tests/conftest.py
imports: from pathlib import Path
  import pandas
  import pytest
label_desc: Use image node_id 4 for calling a global function with example usage: pytest_configure(config) without return types